Randy,
I have replaced batteries in two units so far, which I bought on ebay (6V) and
they fitted absolutelly perfect, no need to rework an metal and there was o
isue with shortages. So there certainly are standard 6V batteries that fit
without mods. I always try to keep things in original
Randy,
that is strange. two things come in mind that might be worth checking. first,
is the mains frequency setting of the 3458a set to 60Hz (I assume you are in
the US)? this is important to suppress mains ac disturbing the measurement.
secondly, have you connected guard? tsp cables would be
Randy,
I looked at the 3458a input impedance, and it is difficult to get the meter set
to the FixedZ (10M) mode. However, the 100v range is 10M. It should default to
HiZ on reset.
I forgot to mention to check the outputs and guard resistance to ground. One of
my 732a had some foam baffling
The output impedance of both the 1v outputs is ~1k ohm. I wonder if Randy could
check the 3458a input impedance with a 10M ohm resistor and the 10v output of
the 732a.
I was thinking that the 732a needed a minimum battery voltage to allow the in
cal led to turn on with the short to the Lo
Never mind. I tested it myself. You should be able to get the in cal led
working without batteries.
Todd
On Sat, Aug 23, 2014 at 7:20 AM, Todd Micallef tmical...@gmail.com wrote:
The output impedance of both the 1v outputs is ~1k ohm. I wonder if Randy
could check the 3458a input impedance
I think the 'IN CAL' LED has to do with a 'minimum voltage' but I don't
think it has to with a minimum battery voltage.
When you remove the battery pack, with the unit plugged in, I don't think
the 'IN CAL' LED goes out. Otherwise, you would never be able to swap
battery packs.
Joe
Hello Randy,
your stability measurements of 732A versus 3458A depend on the
integration time.
It is not possible that way to distinguish, which of both instruments
contribute more noise.
For NPLC 100, you may expect around 0.1ppm noise, i.e 1µV/10V, at NPLC
1000, maybe 0.01ppm.
(mains
Randy:
I get 6 volt 4 amp/hr (or 4.5 amp/hr) batteries and they will fit
perfect. Power Sonic PS-640, Genesis NP4-6, Panasonic LC-R064R5C and others
that are in this size and package. Order from one of the usual electronics
distributors like Allied, Mouser, Digikey. This is a very common
Hi Mark,
I had success using your HP3458.exe on my HP3458A! I just backed up my
CAL data a few minutes ago. I have been interested in doing a backup for
several years but kept putting off buying the GPIB to USB adapter. I
have been using a NI GPIB-ENET/100 for some years now and so your
